Improvement in check-valves



Witnesses: Inventor: 65, K) WWW n C/ M. aw? Per r 5 I f t Attorneys.

A Mimi t NITED STATES MARSHALL T. DAVIDSON, OF BROOKLYN, NEW YORK.

IMPRQVEMENT IN CHECK-VALVES.

Specification forming part of Letters Patent No. 14?,614, dated February17, 1874; application filed November 15, 1873.

To all whom it may concern:

Be it known that I, MARSHALL T. DAVLD- SON, of Brooklyn, in the countyof Kings and State of New York, have invented a new and ImprovedCheck-Valve, of which the following is a specification:

The accompanying drawing represents a vertical central section of myimproved checkvalve.

The invention will first be fully described, and then pointed out in theclaim.

In the drawing, A represents the globeshaped elbow-piece, to whosetubular extension 13 the steam or water pipes are screwed under suitableangle in the usual manner. The valve-seat (J is cast in one piece, wit-hthe globe part A projecting in the shape of a cup horizontally from theentrance side of the steam, the lower outer part of seat 0 being curvedupward, while the upper part projects vertically downward, narrowing thesteam-entrance pipe, and connecting the same with the cup-shaped seat inthe form of an S, to the aperture of which the valve D is closelyfitted. The steam enters below the valve D, in the manner indicated byarrows in the drawing, presses equally on all parts of the same, andlifts it vertically from the seat. The valvestem at is guided in aring-shaped extension,

I), of screw-cap E, which is placed vertically.

above the seat 0, being easily detachable, and allowing therebyconvenient access to the interior of the valve. The globe-shaped elbow Aforms an annular chamber around the cupshaped seat, through which thesteam or water is easily conducted to the exit-pipe, their return beingchecked in an effective manner by their vertical downward pressureexerted on the valve, securing it more tightly in its seat. The valveworks thus easily in both direct-ions, and forms by its position at theel bow-joint of the pipes a very convenient and efficient connection ofthe same.

Having thus described my invention, I claim as new and desire to secureby Letters Iatent-- The combination of the globe-shaped elbow, having ahorizontal valve-seat, as described, with a screw-cup arrangedvertically above the seat, with ring-shaped extension for guiding thevalve in a vertical direction, substantially as and for the purposes setforth.

MARSHALL T. DAVIDSON.

Witnesses:

HENRY BARAGWANATH, RIoHD. LoPPIN.

